title: (E)-9-(But-2-en-1-yl)-6-chloro-9H-purine.
abstract: The asymmetric unit of the title compound, C9H9ClN4, contains two mol-ecules. In the crystal, the mol-ecules are ordered in a chain-like fashion along the a axis, and form layers offset relative to the C plane by approximately 30°. This ordering does not, however, appear to be directed by classical hydrogen bonding.The allylic side chains of both independent mol-ecules are disordered, with occupancies of 0.870 (4) and 0.934 (3) for the major components. The disorder components represent two possible spatial orientations of the atoms around the C=C double bond.
authors.affiliation: Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, PO Box 1126, 0315 Oslo, Norway.
authors.forename: Fredrik
authors.initials: F
authors.lastname: Lundvall
authors.forename: Jindrich
authors.initials: J
authors.lastname: Kania
authors.forename: Lise-Lotte
authors.initials: LL
authors.lastname: Gundersen